Stoichiometry

291. The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be

  1. 2M
  2. M/2
  3. M
  4. M/4

Correct answer: (A)
2M

292. The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75 ρ at a temperature of _________ °K.

  1. 273°
  2. 300°
  3. 400°
  4. 373°

Correct answer: (C)
400°

293. The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to

  1. 1.5
  2. 15
  3. 150
  4. 1500

Correct answer: (D)
1500

294. The depression in freezing point of a solution is

  1. Inversely proportional to the mass of solvent
  2. Directly proportional to the mole of solute
  3. Both (A) and (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) and (B)

295. The effect of pressure on the heat capacity of the gases _________ is negligible.

  1. At pressure below one atmosphere
  2. Below the critical temperature
  3. Both (A) & (B)
  4. Neither (A) nor (B)

Correct answer: (C)
Both (A) & (B)

296. The elevation in boiling point of a solution is proportional to the _________ of the solution.

  1. Molal concentration
  2. Reciprocal of the molal concentration
  3. Normality
  4. Molarity

Correct answer: (A)
Molal concentration

297. The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the

  1. Phase rule
  2. Experimental data
  3. Empirical equations
  4. Theoretical equations

Correct answer: (A)
Phase rule

298. The evaporation of aqueous solution of sugar causes its molarity to

  1. Decrease
  2. Increase
  3. Remain unchanged
  4. Either (A) or (B); depends on the concentration of the solution

Correct answer: (C)
Remain unchanged

299. The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation

  1. Increases with pressure rise
  2. Decreases with increasing pressure
  3. Becomes zero at the critical point
  4. Both (B) & (C)

Correct answer: (D)
Both (B) & (C)

300. The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the

  1. Nature of both the gas & the liquid
  2. Temperature
  3. Total pressure
  4. None of these

Correct answer: (D)
None of these

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